For which of the following reactions is AHn equal to AH of the product(s)?You do not need to look up any values to answer this question. Check all that apply. • View Available Hint(s) O (s, graphite) + 02(g)CO, (g) O CO(g) + O2(g)→CO2(g) O Na(s) +Cl2(g)→NACI(s) O 2Na(s) + Cl2 (g)→2N2CI(s) O Na(s) +Cl2 (1)→NaCl(s) O BaCO3 (s)→BaO(s) + CO2 (g)
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
![Formation Reactions
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The standard heat of formation, AH, is defined as
I Review Constants Periodic Table
the enthalpy change for the formation of one mole of
substance from its constituent elements in their
standard states. Thus, elements in their standard states
have AH
Part A
=0. Heat of formation values can be used
to calculate the enthalpy change of any reaction.
For which of the following reactions is AHn equal to AH of the product(s)?You do not need to look up
Consider, for example, the reaction
any values to answer this question.
Check all that apply.
2NO(g) + O2(g) = 2NO2(g)
• View Available Hint(s)
with heat of formation values given by the following
table:
C(s, graphite) + O2 (g)→CO2(g)
AH;
(kJ/mol)
Substance
O CO(g) +O2(g)→CO2(g)
NO(g)
90.2
O2(g)
O Na(s) + Cl2 (g)→NaCl(s)
NO2(g)
33.2
2Na(s) + Cl2 (g)–→2NACI(s)
Then the standard heat of reaction for the overall
reaction is
O Na(s) + Cl2 (1)→NaCl(s)
BaCO3 (s)→BaO(s) + CO2 (g)
AHn= AH (products)– AH:(reactants)
[2(90.2) + 0]
2(33.2)
-114 kJ
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